Abstract：With ascorbic acid as reductant, gelatin as dispersant, AgNO3 as reaction precursor, ultra-fine sliver powders were prepared by liquid phase reduction method. The effects of dosage and adding ways of gelatin on particle size, morphology and dispersion were investigated, and the dispersion mechanism of gelatin was explored. The silver powders were characterized by means of XRD, EDS, SEM and TEM. The results show that the ultra-fine silver particles are nearly spherical, and 0.1 to 1.2 μm in size. There is no significant effect of gelatin on the morphology of silver particles, but some effects on the particle size and the dispersion. As the dosage of gelatin increase the size of silver particles is larger, the dispersion is better. The dispersion mechanism of gelatin is mainly stereohindrance effect.

Keywords：ultra-fine silver powder; gelatin; dispersion mechanism

中图分类号：TQ063          文献标志码：A